How to Merge DataGridView Header Cells in WinForms to Improve Data Presentation?

Merge DataGridView cells in WinForms

Question:

DataGridView displays a list of data in the form of rows and columns. In this example, the data is organized into groups, and each group has a header cell (Hd1). The goal is to merge these header cells to improve data display.

Solution:

To merge cells in a DataGridView, you first need to identify duplicate values ​​in the columns you want to merge. The following solution contains two methods and event handlers:

• How to check duplicate values:

<code class="language-csharp">bool IsTheSameCellValue(int column, int row)
{
    DataGridViewCell cell1 = dataGridView1[column, row];
    DataGridViewCell cell2 = dataGridView1[column, row - 1];
    if (cell1.Value == null || cell2.Value == null)
    {
       return false;
    }
    return cell1.Value.ToString() == cell2.Value.ToString();
}</code>

• Cell draw event handler:

<code class="language-csharp">private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    e.AdvancedBorderStyle.Bottom = DataGridViewAdvancedCellBorderStyle.None;
    if (e.RowIndex < 1 || !IsTheSameCellValue(e.ColumnIndex, e.RowIndex))
    {
        return;
    }
    // ... (其余代码处理单元格合并的视觉效果) ...
}</code>

• Cell formatting event handler:

<code class="language-csharp">if (e.RowIndex == 0)
    return;
if (IsTheSameCellValue(e.ColumnIndex, e.RowIndex))
{
    e.Value = "";
    e.FormattingApplied = true;
}</code>

• Form loading logic:

<code class="language-csharp">dataGridView1.AutoGenerateColumns = false;</code>

Result:

By implementing these methods and event handlers, you can merge cells in a DataGridView, resulting in a cleaner, more visually appealing presentation of your data.

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